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M.V. Makarova, P.E. Kazin, Yu.D. Tretyakov, M. Jansen, M. Reissner, W. Steiner:
"Zr, Hf, Mo and W-containing oxide phases as pinning additives in Bi-2212 superconductor";
Physica C: Superconductivity and its Applications, 419 (2005), 61 - 69.

Zr, Hf, Mo and W-containing oxide phases as pinning additives in Bi-2212 superconductor

M.V. Makarova, Corresponding Author Contact Information, E-mail The Corresponding Author, P.E. Kazin, Yu.D. Tretyakov, M. Jansen, M. Reissner next term and W. Steiner

Chemistry Department, Moscow State University, Leninskie gori, 119992 Moscow, Russia
Max-Plank-Institute für Festkörperforschung, D-70569 Stuttgart, Germany
Vienna University of Technology, Wiedner Hauptstraβe 8-10, A-1040 Vienna, Austria
Received 7 April 2004; revised 30 November 2004; accepted 7 December 2004. Available online 30 December 2004.

Abstract

Phase formation was investigated in Bi-Sr-Ca-Cu-M-O (M = Mo, W) systems at 850-900 °C. It was found that Sr2CaMO6 phases were chemically compatible with Bi-2212. The composites Bi-2212-Sr2CaMO6 and Bi-2212-SrAO3 (A = Zr, Hf) were obtained from a sol-gel precursor using crystallisation from the melt. The materials consisted of Bi-2212 matrix and submicron or micron grains of the corresponding dispersed phase. Tc was equal or exceeded that for undoped Bi-2212, reaching Tc = 97 K in the Mo-containing composite. The composites exhibited enhanced pinning in comparison with similar prepared pure Bi-2212, especially at T = 60 K. The best pinning parameters were observed for the Bi-2212-Sr2CaWO6 composite.

Composite; BSCCO; Pinning; Trapping-pushing theory

http://dx.doi.org/10.1016/j.physc.2004.12.003

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